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Assessment of acetabular version in total hip arthroplasty: an application of Widmer's technique in a regional setting
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posted on 2018-06-01, 00:00 authored by Jason Trieu, Alexandra E F Hadden, Alasdair SutherlandAlasdair SutherlandBACKGROUND: Acetabular prosthesis positioning in total hip arthroplasty is important in reducing the risk of dislocation. Assessment of version by computed tomography scan is expensive and involves a large radiation dose. We wished to assess the value of Widmer's technique, utilizing readily available radiographs, to determine cup anteversion. METHODS: Patients who underwent primary total hip arthroplasty by the senior author (AGS) at a single regional hospital over a 5-year period were eligible for inclusion. Measurements were performed using the technique described by Widmer, utilizing standard post-operative radiographs. Statistical analysis was undertaken in SPSS v22. Significance was accepted at P < 0.05. RESULTS: Assessment included 109 hips in 99 patients; 63 hips with cemented cups and 46 hips with uncemented cups. Mean acetabular anteversion in the cemented group was 11.9° (0-27.7, SD: 7) and in the uncemented group was 14.1° (10.3-32.7, SD: 7.1); this difference trended towards statistical significance (P = 0.09). Test-retest measurements showed high degree of correlation (Pearson test: 0.927, P < 0.001). There were 96 of 109 hips positioned in the Lewinnek safe zone of 5-25° anteversion. The crude dislocation rate in our cohort was 6.4% (7 of 109 hips) with all dislocations occurring in hips placed in the safe zone. CONCLUSION: Widmer's technique is a reliable method for calculating acetabular version in a regional hospital setting and offers the individual surgeon a ready technique of personal quality control. Cup version was not a significant factor contributing to dislocation rates in our series.
History
Journal
ANZ Journal of SurgeryVolume
88Issue
6Pagination
573 - 576Publisher
WileyLocation
London, Eng.Publisher DOI
ISSN
1445-1433eISSN
1445-2197Language
engPublication classification
C1 Refereed article in a scholarly journalCopyright notice
2018, Royal Australasian College of SurgeonsUsage metrics
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